<template>
  <!-- collapse既可以用mapState获得，也可以用$store.state.xxx获取，两种拿vuex全局变量的方式而已 -->
  <div id="main-container" class="main-container" :class="$store.state.app.collapse?'position-collapse-left':'position-left'">
    <!--  标签页  -->
    <div class="tab-container">
      <el-tabs class="tabs" :class="$store.state.app.collapse?'position-collapse-left':'position-left'"
               v-model="mainTabsActiveName" :closable="true" type="card"
               @tab-click="selectedTabHandle" @tab-remove="removeTabHandle">
        <el-dropdown class="tabs-tools" :show-timeout="0" trigger="hover">
          <div style="font-size:20px;width:50px;"><i class="el-icon-arrow-down"></i></div>
          <el-dropdown-menu slot="dropdown">
            <el-dropdown-item @click.native="tabsCloseCurrentHandle">关闭当前标签</el-dropdown-item>
            <el-dropdown-item @click.native="tabsCloseOtherHandle">关闭其它标签</el-dropdown-item>
            <el-dropdown-item @click.native="tabsCloseAllHandle">关闭全部标签</el-dropdown-item>
            <el-dropdown-item @click.native="tabsRefreshCurrentHandle">刷新当前标签</el-dropdown-item>
          </el-dropdown-menu>
        </el-dropdown>
        <el-tab-pane v-for="item in mainTabs" :key="item.name" :label="item.title" :name="item.name">
          <span slot="label"><i :class="item.icon"></i> {{item.title}} </span>
        </el-tab-pane>
      </el-tabs>
    </div>
    <!--  主内容区域  -->
    <div class="main-content">
      <keep-alive>
        <transition name="fade" mode="out-in">
          <router-view></router-view>
        </transition>
      </keep-alive>
    </div>
  </div>
</template>

<script>
export default {
  name: 'MainContent',
  data () {
    return {}
  },
  computed: {
    mainTabs: {
      get () {
        return this.$store.state.tab.mainTabs
      },
      set (val) {
        this.$store.commit('updateMainTabs', val)
      }
    },
    mainTabsActiveName: {
      get () {
        return this.$store.state.tab.mainTabsActiveName
      },
      set (val) {
        this.$store.commit('updateMainTabsActiveName', val)
      }
    }
  },
  methods: {
    // tabs, 选中tab
    selectedTabHandle (tab) {
      tab = this.mainTabs.filter(item => item.name === tab.name)
      if (tab.length >= 1) {
        this.$router.push({ name: tab[0].name })
      }
    },
    // tabs, 删除tab
    removeTabHandle (tabName) {
      this.mainTabs = this.mainTabs.filter(item => item.name !== tabName)
      if (this.mainTabs.length >= 1) {
        // 当前选中tab被删除
        if (tabName === this.mainTabsActiveName) {
          this.$router.push({ name: this.mainTabs[this.mainTabs.length - 1].name }, () => {
            this.mainTabsActiveName = this.$route.name
          })
        }
      } else {
        this.$router.push('/')
      }
    },
    // tabs, 关闭当前
    tabsCloseCurrentHandle () {
      this.removeTabHandle(this.mainTabsActiveName)
    },
    // tabs, 关闭其它
    tabsCloseOtherHandle () {
      this.mainTabs = this.mainTabs.filter(item => item.name === this.mainTabsActiveName)
    },
    // tabs, 关闭全部
    tabsCloseAllHandle () {
      this.mainTabs = []
      this.$router.push('/')
    },
    // tabs, 刷新当前
    tabsRefreshCurrentHandle () {
      const tempTabName = this.mainTabsActiveName
      this.removeTabHandle(tempTabName)
      this.$nextTick(() => {
        this.$router.push({ name: tempTabName })
      })
    }
  }
}
</script>

<style lang="scss" scoped>
  .main-container {
    padding: 0 5px 5px;
    position: absolute;
    top: 60px;
    left: 1px;
    right: 1px;
    bottom: 0px;
    // background: rgba(56, 5, 114, 0.5);
    .tabs {
      position: fixed;
      top: 60px;
      right: 50px;
      padding-left: 0px;
      padding-right: 2px;
      z-index: 1020;
      height: 40px;
      line-height: 40px;
      font-size: 14px;
      background: rgb(255, 253, 255);
      border-color: rgba(200, 206, 206, 0.5);
      // border-left-width: 1px;
      // border-left-style: solid;
      border-bottom-width: 1px;
      border-bottom-style: solid;
    }

    .tabs-tools {
      position: fixed;
      top: 60px;
      right: 0;
      z-index: 1020;
      height: 40px;
      // padding: 0 10px;
      font-size: 14px;
      line-height: 40px;
      cursor: pointer;
      border-color: rgba(200, 206, 206, 0.5);
      border-left-width: 1px;
      border-left-style: solid;
      border-bottom-width: 1px;
      border-bottom-style: solid;
      background: rgba(255, 255, 255, 1);
    }

    .tabs-tools:hover {
      background: rgba(200, 206, 206, 1);
    }

    .main-content {
      position: absolute;
      top: 45px;
      left: 5px;
      right: 5px;
      bottom: 5px;
      padding: 5px;
      // background: rgba(209, 212, 212, 0.5);
    }
  }

  .position-left {
    left: 200px;
  }

  .position-collapse-left {
    left: 65px;
  }
</style>
